Added Git Initialisation Hooks (pybamm-team#32)

+ Added `git` initialisation hooks in the template to automatically
initialise a `git repository` when a `generated project` is created by
`cookiecutter`.
+ Added a default `main` branch parameter for git repository
initialisation.

Subtask - pybamm-team#26

cookiecutter.json

@@ -6,6 +6,7 @@
     ],
     "org": "pybamm-team",
     "url": "https://{{ cookiecutter.platform }}.com/{{ cookiecutter.org }}/{{ cookiecutter.project_name }}",
+    "branch": "main",
     "full_name": "John Doe",
     "email": "[email protected]",
     "project_short_description": "A template for creating battery modeling projects based on PyBaMM",
@@ -31,7 +32,8 @@
             "gitlab": "GitLab"
         },
         "org": "The name of your organisation (or username, if you are not part of an organisation)",
-        "url": "The URL to your repository",
+        "url": "The Origin URL to your repository",
+        "branch": "The default branch of your repository",
         "full_name": "Your name",
         "email": "Your email",
         "project_short_description": "A short description of your project",

hooks/post_gen_project.py

@@ -0,0 +1,24 @@
+import subprocess
+
+from pathlib import Path
+
+def prepare_git() -> None:
+
+    git_author_name = "{{cookiecutter.full_name}}"
+    git_author_email = "{{cookiecutter.email}}"
+    git_branch = "{{cookiecutter.branch}}"
+
+    # Initialise git
+    subprocess.call(
+        ["git", "init", "-b", git_branch]
+    )
+    subprocess.call(
+        ["git", "config", "user.name", git_author_name]
+    )
+    subprocess.call(
+        ["git", "config", "user.email", git_author_email]
+    )
+
+if __name__ == "__main__":
+    print("Executing script!!")
+    prepare_git()